| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 1.07 | 151 |
| 2014 | 1.06 | 157 |
| 2013 | 1.11 | 161 |
| 2012 | 1.15 | 157 |
| 2011 | 1.08 | 159 |
| 2010 | 1.1 | 159 |
| 2009 | 1.08 | 156 |
| 2008 | 1.06 | 158 |
| 2007 | 1.06 | 162 |
| 2006 | 1.09 | 159 |
| 2005 | 1.12 | 159 |
| 2004 | 1.24 | 159 |
| 2003 | 1.31 | 157 |
| 2002 | 1.39 | 157 |
| 2001 | 1.39 | 155 |
| 2000 | 1.53 | 154 |
| 1999 | 1.59 | 151 |
| 1998 | 1.63 | 151 |
| 1997 | 1.56 | 152 |
| 1996 | 1.7 | 151 |
| 1995 | 1.7 | 151 |
| 1994 | 1.95 | 134 |
| 1993 | 1.7 | 132 |
| 1992 | 1.85 | 128 |
| 1991 | 1.94 | 125 |
| 1990 | 2.08 | 123 |
| 1989 | 2.14 | 110 |
| 1988 | 2.2 | 106 |
| 1987 | 2.35 | 105 |
| 1986 | 2.5 | 100 |